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(2018) CHEMISTRY
If necessary, use the following data to answer the questions below.
Atomic Weight: H = 1.0, C = 12.0, N = 14.0, O = 16.0, S = 32.0, Cu = 64.0 Molar volume of gas at the standard state: 22.4 L / mol
Gas constant: = 0.082 atm L / ( K mol ) = 8.31×103 Pa L / ( K mol ) Avogadro constant: A = 6.02×1023 / mol
Pressure: 1 atm = 1.01×105 Pa = 760 mmHg Faraday constant: = 9.65×104 C / mol
Choose the correct answer from the choices to below. Select the closest one, when your calculated result does not exactly match any of the values of the alternatives in each group.
Q1 Which of the following elements is not the noble gas ?
Ne Ar Br Kr Xe
Q2 Which of the following elements has the smallest electronegativity ?
K Cl Zn Li O
Nationality No.
Name
(Please print full name, underlining family name) Marks
Q3 Which of the following atoms has the most valence electrons ? N S Na Si F
Q4 Which of the following molecules has the most lone pair electrons ?
CH3OH C2H4 NH3
CO2 HCl
Q5 Which of the following oxides is an amphoteric oxide ? NO2 CO2 Na2O CaO ZnO
Q6 Which of the following compounds has the maximum mass percentage of carbon in the compound ?
CH3CHO C2H5OH CH3OCH3
CH3OH CH3COOH
Q7 The volume percentage of hydrogen, H2, gas is 30 % in a mixture of hydrogen gas and methane, CH4, gas at the standard state. Answer the following questions.
(A) Calculate the density of the mixed gas.
0.28 g / L 0.53 g / L 2.8 g / L 5.3 g / L 28 g / L
(B) Calculate the heat evolved in a complete combustion of 10.0 L of the mixed gas at the standard state. The heats of combustion of hydrogen and methane are 286 and 891 kJ / mol, respectively.
103 kJ 209 kJ 317 kJ
421 kJ 533 kJ
Q8 The density of 17.0 % sulfuric acid, H2SO4, is 1.12 g / mL. Calculate the molar concentration of the sulfuric acid.
0.9 mol / L 1.9 mol / L 2.9 mol / L 3.9 mol / L 4.9 mol / L
Q9 The solubilities of copper (II) sulfate, CuSO4, in water are 20 [g / 100 g H2O]
at 293 K, and 54 [g / 100 g H2O] at 353 K. How many grams of copper (II) sulfate pentahydrate, CuSO4 5H2O, will crystallize out of 200 g of a solution saturated at 353 K if it cools to 293 K ?
32 g 41 g 55 g 64 g 77 g
Q10 Calculate the degree of ionization, , of ïòð I ïð mol / L acetic acid, CH3COOH. The ionization constant, a, of acetic acid is îòé I ïð mol / L.
Use the following value, if necessary.
í ã ïòéí
0.017 0.026 0.035
0.043 0.052
Q11 The mass of oxygen, O2, gas occupied a volume of 550 mL is 0.96 g at 330 K.
Calculate the pressure of the oxygen gas.
0.35 105 Pa 0.75 105 Pa 1.5 105 Pa 2.5 105 Pa 4.0 105 Pa
Q12 In the following reaction, which of the following procedures is correct for the displacement of the equilibrium in the right direction ?
Ò õ íØ îÒØ õ çî µÖ
Raising the temperature Decreasing the pressure Reducing the amount of NH3
Reducing the amount of N2
Reducing the amount of H2
Q13 A certain amount of oxalic acid, (COOH)2, reacted with 200 mL of 0.020 mol/L potassium permanganate, KMnO4, to oxidize completely. Calculate the mass of the oxalic acid.
0.36 g 0.90 g 1.1 g 1.4 g 1.8 g
Q14 When electrolysis of a sulfuric acid, H2SO4, was carried out at 2.0 A for 25 min using a platinum, Pt, electrode, oxygen, O2, gas was liberated. Calculate the volume of the oxygen gas at the standard state.
0.14 L 0.17 L 0.34 L 0.51 L 0.68 L
Q15 Which of the following gases is the colored gas ?
NO2 SO2 CO2 H2S NH3
Q16 Which of the following metal complex ion solutions is the colored solution ? [Cu(NH3)4] 2+ [Zn(NH3)4] 2+ [Ag(NH3)2] +
[Zn(OH)4] 2 [Al(OH)4]
Q17 How many isomers are there for the compound with molecular formula C2H4O ?
1 2 3 4 5
Q18 Which of the following molecules has a positive reaction in the Fehling’s solution test ?
Acetone Dimethyl ether Ethanol Acetaldehyde Acetic acid
Q19 Which of the following molecules does not react with ethylene CH2=CH2 ?
Cl2 Br2 H2 N2 HCl
